[v2] NSIS installer support for Windows (#1184)

* [v2] Add support for post build hooks

Currently only supports build-level hooks

* [v2] Improve build assets handling and use single source for manifest generation

The manifest asset files are now a go template and data will be
resolved before they are included into the build output.

Breaking Change: Windows manifest file must be named
“wails.exe.manifest” and doesn’t depend on the project name
anymore.

* [v2, windows] NSIS installer generation

v2/internal/project/project.go

@@ -46,9 +46,25 @@ type Project struct {
 	// The platform to target
 	Platform string
 
+	// RunNonNativeBuildHooks will run build hooks though they are defined for a GOOS which is not equal to the host os
+	RunNonNativeBuildHooks bool `json:"runNonNativeBuildHooks"`
+
+	// Post build hooks for different targets, the hooks are executed in the following order
+	// Key: GOOS/GOARCH - Executed at build level after a build of the specific platform and arch
+	// Key: GOOS/*      - Executed at build level after a build of the specific platform
+	// Key: */*         - Executed at build level after a build
+	// The following keys are not yet supported.
+	// Key: GOOS        - Executed at platform level after all builds of the specific platform
+	// Key: *           - Executed at platform level after all builds of a platform
+	// Key: [empty]     - Executed at global level after all builds of all platforms
+	PostBuildHooks map[string]string `json:"postBuildHooks"`
+
 	// The application author
 	Author Author
 
+	// The application information
+	Info Info
+
 	// Fully qualified filename
 	filename string
 
@@ -60,6 +76,9 @@ type Project struct {
 
 	// Arguments that are forwared to the application in dev mode
 	AppArgs string `json:"appargs"`
+
+	// NSISType to be build
+	NSISType string `json:"nsisType"`
 }
 
 func (p *Project) Save() error {
@@ -76,6 +95,14 @@ type Author struct {
 	Email string `json:"email"`
 }
 
+type Info struct {
+	CompanyName    string  `json:"companyName"`
+	ProductName    string  `json:"productName"`
+	ProductVersion string  `json:"productVersion"`
+	Copyright      *string `json:"copyright"`
+	Comments       *string `json:"comments"`
+}
+
 // Load the project from the current working directory
 func Load(projectPath string) (*Project, error) {
 
@@ -117,6 +144,24 @@ func Load(projectPath string) (*Project, error) {
 		}
 	}
 
+	if result.Info.CompanyName == "" {
+		result.Info.CompanyName = result.Name
+	}
+	if result.Info.ProductName == "" {
+		result.Info.ProductName = result.Name
+	}
+	if result.Info.ProductVersion == "" {
+		result.Info.ProductVersion = "1.0.0"
+	}
+	if result.Info.Copyright == nil {
+		v := "Copyright........."
+		result.Info.Copyright = &v
+	}
+	if result.Info.Comments == nil {
+		v := "Built using Wails (https://wails.app)"
+		result.Info.Comments = &v
+	}
+
 	// Return our project data
 	return &result, nil
 }