Added highdpi window icons in original theme color.

unity/close.svg

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+<?xml version="1.0" encoding="utf-8"?><svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="24px" height="24px" viewBox="0 0 24 24"><path id="a" fill="#DCDCDC" d="M16,8c0,0,0,0.2-0.1,0.6c0,0.2-0.1,0.4-0.1,0.7c0,0.1-0.1,0.3-0.1,0.4c0,0.1-0.2,0.2-0.3,0.3c-0.7,0.7-1.7,1.7-2.7,2.7c-1,1-2,2-2.7,2.7c-0.1,0.1-0.1,0.2-0.3,0.3c-0.1,0-0.3,0.1-0.4,0.1c-0.2,0.1-0.5,0.1-0.7,0.1C8.2,16,8,16,8,16s0-0.2,0.1-0.6c0-0.2,0.1-0.4,0.1-0.7c0-0.1,0.1-0.3,0.1-0.4c0-0.1,0.2-0.2,0.3-0.3c0.7-0.7,1.7-1.7,2.7-2.7c1-1,2-2,2.7-2.7c0.1-0.1,0.1-0.2,0.3-0.3c0.1,0,0.3-0.1,0.4-0.1c0.2-0.1,0.5-0.1,0.7-0.1C15.7,8,16,8,16,8z"/><use xlink:href="#a" transform="matrix(-1,0,0,1,24,0)"/></svg>

unity/close_focused_normal.svg

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+./close.svg

unity/close_focused_prelight.svg

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+<?xml version="1.0" encoding="utf-8"?><svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="24px" height="24px" viewBox="0 0 24 24"><path id="a" fill="#d64937" d="M16,8c0,0,0,0.2-0.1,0.6c0,0.2-0.1,0.4-0.1,0.7c0,0.1-0.1,0.3-0.1,0.4c0,0.1-0.2,0.2-0.3,0.3c-0.7,0.7-1.7,1.7-2.7,2.7c-1,1-2,2-2.7,2.7c-0.1,0.1-0.1,0.2-0.3,0.3c-0.1,0-0.3,0.1-0.4,0.1c-0.2,0.1-0.5,0.1-0.7,0.1C8.2,16,8,16,8,16s0-0.2,0.1-0.6c0-0.2,0.1-0.4,0.1-0.7c0-0.1,0.1-0.3,0.1-0.4c0-0.1,0.2-0.2,0.3-0.3c0.7-0.7,1.7-1.7,2.7-2.7c1-1,2-2,2.7-2.7c0.1-0.1,0.1-0.2,0.3-0.3c0.1,0,0.3-0.1,0.4-0.1c0.2-0.1,0.5-0.1,0.7-0.1C15.7,8,16,8,16,8z"/><use xlink:href="#a" transform="matrix(-1,0,0,1,24,0)"/></svg>

unity/close_focused_pressed.svg

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+<?xml version="1.0" encoding="utf-8"?><svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="24px" height="24px" viewBox="0 0 24 24"><path id="a" fill="#D64937" opacity="0.75" d="M16,8c0,0,0,0.2-0.1,0.6c0,0.2-0.1,0.4-0.1,0.7c0,0.1-0.1,0.3-0.1,0.4c0,0.1-0.2,0.2-0.3,0.3c-0.7,0.7-1.7,1.7-2.7,2.7c-1,1-2,2-2.7,2.7c-0.1,0.1-0.1,0.2-0.3,0.3c-0.1,0-0.3,0.1-0.4,0.1c-0.2,0.1-0.5,0.1-0.7,0.1C8.2,16,8,16,8,16s0-0.2,0.1-0.6c0-0.2,0.1-0.4,0.1-0.7c0-0.1,0.1-0.3,0.1-0.4c0-0.1,0.2-0.2,0.3-0.3c0.7-0.7,1.7-1.7,2.7-2.7c1-1,2-2,2.7-2.7c0.1-0.1,0.1-0.2,0.3-0.3c0.1,0,0.3-0.1,0.4-0.1c0.2-0.1,0.5-0.1,0.7-0.1C15.7,8,16,8,16,8z"/><use xlink:href="#a" transform="matrix(-1,0,0,1,24,0)"/></svg>

unity/close_unfocused.svg

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+<?xml version="1.0" encoding="utf-8"?><svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="24px" height="24px" viewBox="0 0 24 24"><path id="a" fill="#AAAAAA" d="M16,8c0,0,0,0.2-0.1,0.6c0,0.2-0.1,0.4-0.1,0.7c0,0.1-0.1,0.3-0.1,0.4c0,0.1-0.2,0.2-0.3,0.3c-0.7,0.7-1.7,1.7-2.7,2.7c-1,1-2,2-2.7,2.7c-0.1,0.1-0.1,0.2-0.3,0.3c-0.1,0-0.3,0.1-0.4,0.1c-0.2,0.1-0.5,0.1-0.7,0.1C8.2,16,8,16,8,16s0-0.2,0.1-0.6c0-0.2,0.1-0.4,0.1-0.7c0-0.1,0.1-0.3,0.1-0.4c0-0.1,0.2-0.2,0.3-0.3c0.7-0.7,1.7-1.7,2.7-2.7c1-1,2-2,2.7-2.7c0.1-0.1,0.1-0.2,0.3-0.3c0.1,0,0.3-0.1,0.4-0.1c0.2-0.1,0.5-0.1,0.7-0.1C15.7,8,16,8,16,8z"/><use xlink:href="#a" transform="matrix(-1,0,0,1,24,0)"/></svg>

unity/close_unfocused_prelight.svg

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+./close_focused_prelight.svg

unity/close_unfocused_pressed.svg

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+./close_focused_pressed.svg

unity/maximize.svg

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+<?xml version="1.0" encoding="utf-8"?><svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="24px" height="24px" viewBox="0 0 24 24" xml:space="preserve"><path fill="#DCDCDC" d="M14,14h-4v-4h4V14z M16,8H8v8h8V8z"/></svg>

unity/maximize_focused_normal.svg

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+./maximize.svg

unity/maximize_focused_prelight.svg

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+<?xml version="1.0" encoding="utf-8"?><svg version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" x="0px" y="0px" width="24px" height="24px" viewBox="0 0 24 24" xml:space="preserve"><path fill="#d64937" d="M14,14h-4v-4h4V14z M16,8H8v8h8V8z"/></svg>