Build improvements + fix for window size/position (macOS) (#5771)

* Allow using relative path in MacOS for development builds
* [macOS] Fixes RT "cache"/"config" folder not located in the right place
In actual "dev" branch, RT "cache"/"config" folder is located in
"~/Application Support/RawTherapee" folder instead of
"~/Library/Application Support/RawTherapee" folder (as in v5.8 release
and discribed in RawPedia). Moreover, "CACHE_NAME_SUFFIX" cMake option
was not anymore considered.
* [macOS] Remember RT window position correctly, fixes #3209

As described in GTK documentation, some OS Windows Manager do not
consider setting window size and position before it is completely
created (which seems to be the case for macOS). In this commit,
restoring window size/position is now done after its creation.
Morevover, macOS menu bar height is now considered.

CMakeLists.txt

@@ -68,6 +68,11 @@ set(CACHE_NAME_SUFFIX
     ""
     CACHE STRING "RawTherapee's cache folder suffix")
 
+# For macOS only, OSX_DEV_BUILD option allows using relative paths instead of absolute
+# paths. Consequently, for development builds, application can be launching without
+# being bundled. However, file access can be restricted for some folder.
+option(OSX_DEV_BUILD "Generate macOS development builds" OFF)
+
 # By default we don't use a specific processor target, so PROC_TARGET_NUMBER is
 # set to 0. Specify other values to optimize for specific processor architecture
 # as listed in ProcessorTargets.cmake: