Replace hard-coded CHM file name

Author: scheibel

docs/api-docs/doxyfile.in

@@ -1249,7 +1249,7 @@ GENERATE_HTMLHELP      = NO
 # written to the html output directory.
 # This tag requires that the tag GENERATE_HTMLHELP is set to YES.
 
-CHM_FILE               = PixelLightAPI.chm
+CHM_FILE               = @META_PROJECT_ID@.chm
 
 # The HHC_LOCATION tag can be used to specify the location (absolute path
 # including file name) of the HTML help compiler ( hhc.exe). If non-empty