permissions: Remove execute bit from images

* Remove the execute permission on all png and bmp images.
* These files will never need to be executed.
permissions: Remove execute bit from txt and ui files

* Remove the execute permission on all ui and txt files.
* These files will never need to be executed.
permissions: Remove execute bit from src files

* Remove the execute permission on all c, cpp, and header files.
* These files will never need to be executed.
Merge pull request #1855 from kylemanna/perms_fix

Fix Permissions