Use enums instead of bools in public API

Replace the boolean parameters for including user metadata and evaluating conditions with MergeMode and EvalMode enums.

The C++ and Python wrappers still use booleans because they're more constrained than enums in those languages, which can be given invalid values.

python/src/database.rs

@@ -3,7 +3,7 @@ use std::{
     sync::{Arc, RwLock},
 };
 
-use libloot::{WriteMode, error::DatabaseLockPoisonError};
+use libloot::{EvalMode, MergeMode, WriteMode, error::DatabaseLockPoisonError};
 use libloot_ffi_errors::UnsupportedEnumValueError;
 use pyo3::{
     Bound, PyResult, pyclass, pymethods,
@@ -113,7 +113,7 @@ impl Database {
         self.0
             .write()
             .map_err(DatabaseLockPoisonError::from)?
-            .general_messages(evaluate_conditions)
+            .general_messages(to_eval_mode(evaluate_conditions))
             .map(|v| v.into_iter().map(Into::into).collect())
             .map_err(Into::into)
     }
@@ -123,7 +123,7 @@ impl Database {
             .0
             .read()
             .map_err(DatabaseLockPoisonError::from)?
-            .groups(include_user_metadata)
+            .groups(to_merge_mode(include_user_metadata))
             .into_iter()
             .map(Into::into)
             .collect())
@@ -172,7 +172,11 @@ impl Database {
         self.0
             .read()
             .map_err(DatabaseLockPoisonError::from)?
-            .plugin_metadata(plugin_name, include_user_metadata, evaluate_conditions)
+            .plugin_metadata(
+                plugin_name,
+                to_merge_mode(include_user_metadata),
+                to_eval_mode(evaluate_conditions),
+            )
             .map(|p| p.map(Into::into))
             .map_err(Into::into)
     }
@@ -185,7 +189,7 @@ impl Database {
         self.0
             .read()
             .map_err(DatabaseLockPoisonError::from)?
-            .plugin_user_metadata(plugin_name, evaluate_conditions)
+            .plugin_user_metadata(plugin_name, to_eval_mode(evaluate_conditions))
             .map(|p| p.map(Into::into))
             .map_err(Into::into)
     }
@@ -224,6 +228,22 @@ impl From<Arc<RwLock<libloot::Database>>> for Database {
     }
 }
 
+fn to_eval_mode(value: bool) -> EvalMode {
+    if value {
+        EvalMode::Evaluate
+    } else {
+        EvalMode::DoNotEvaluate
+    }
+}
+
+fn to_merge_mode(value: bool) -> MergeMode {
+    if value {
+        MergeMode::WithUserMetadata
+    } else {
+        MergeMode::WithoutUserMetadata
+    }
+}
+
 #[pyclass(eq, ord, frozen, hash, str = "{0:?}")]
 #[derive(Clone, Debug, Default, Eq, PartialEq, Ord, PartialOrd, Hash)]
 #[repr(transparent)]