Move code of shaders from registry and ini to separate files in folder.
Revert "Move code of shaders from registry and ini to separate files in folder."

This reverts commit da59b57a76da243275345bc5e6045382e13102e8.
Update mpc-hc_setup.iss.

* simplify a preprocessor check
* rename a function
* use a wildcard for the translation dlls
* reindent
installer: remove unneeded strings from Inno Setup's language files
custom_messages.iss: update copyright year
checkyear.sh: add .iss files in the files to check
Some testing on SetAlwaysOnTop. (not working)
PPageExternalFilters: cosmetics.

* Use more meaningful functions names.
* Use correct visibility for the members variables and functions.
Updated Swedish translation.