Presets: Cleanup preset naming

Before committing D10224, bundled preset names that are lowercase need
updating to title case for display in the UI. This changes several of
the preset file names to title case, and fixes a couple of other naming
issues in the preset names. A few strings in the code are also changed
to reflect the new filename of the Blender keymap.

release/datafiles/userdef/userdef_default.c

@@ -105,7 +105,7 @@ const UserDef U_default = {
     .autoexec_paths = {NULL},
     .user_menus = {NULL},
 
-    .keyconfigstr = "blender",
+    .keyconfigstr = "Blender",
     .undosteps = 32,
     .undomemory = 0,
     .gp_manhattandist = 1,

release/scripts/modules/bpy/utils/__init__.py

@@ -624,7 +624,7 @@ def keyconfig_init():
     active_config = _preferences.keymap.active_keyconfig
 
     # Load the default key configuration.
-    default_filepath = preset_find("blender", "keyconfig")
+    default_filepath = preset_find("Blender", "keyconfig")
     keyconfig_set(default_filepath)
 
     # Set the active key configuration if different

source/blender/makesdna/DNA_windowmanager_types.h

@@ -215,7 +215,7 @@ enum {
   (WM_OUTLINER_SYNC_SELECT_FROM_OBJECT | WM_OUTLINER_SYNC_SELECT_FROM_EDIT_BONE | \
    WM_OUTLINER_SYNC_SELECT_FROM_POSE_BONE | WM_OUTLINER_SYNC_SELECT_FROM_SEQUENCE)
 
-#define WM_KEYCONFIG_STR_DEFAULT "blender"
+#define WM_KEYCONFIG_STR_DEFAULT "Blender"
 
 /* IME is win32 only! */
 #if !defined(WIN32) && !defined(DNA_DEPRECATED)