Refactor texture overrides and add new features (#9600)

* Refactor texture overrides, and add new features:

- Texture overrides can support multiple targets in one line
- Texture override files can have comment lines
- Item images/wield images can be overridden

* Formatting changes

* Address soime feedback

- Pass vectors by const reference
- Log syntax errors as warnings
- Remove 'C' prefix from TextureOverrideSource

* Simplify override target checks with an inline helper function

* make linter happy

* Apply feedback suggestions

Co-Authored-By: rubenwardy <rw@rubenwardy.com>

* Remove remaining != 0 checks

* Update copyright notice

Co-authored-by: sfan5 <sfan5@live.de>
Co-authored-by: rubenwardy <rw@rubenwardy.com>

src/nodedef.h

@@ -33,6 +33,7 @@ class Client;
 #include "itemgroup.h"
 #include "sound.h" // SimpleSoundSpec
 #include "constants.h" // BS
+#include "texture_override.h" // TextureOverride
 #include "tileanimation.h"
 
 // PROTOCOL_VERSION >= 37
@@ -583,15 +584,12 @@ public:
 	void updateAliases(IItemDefManager *idef);
 
 	/*!
-	 * Reads the used texture pack's override.txt, and replaces the textures
-	 * of registered nodes with the ones specified there.
+	 * Replaces the textures of registered nodes with the ones specified in
+	 * the texturepack's override.txt file
 	 *
-	 * Format of the input file: in each line
-	 * `node_name top|bottom|right|left|front|back|all|*|sides texture_name.png`
-	 *
-	 * @param override_filepath path to 'texturepack/override.txt'
+	 * @param overrides the texture overrides
 	 */
-	void applyTextureOverrides(const std::string &override_filepath);
+	void applyTextureOverrides(const std::vector<TextureOverride> &overrides);
 
 	/*!
 	 * Only the client uses this. Loads textures and shaders required for