[ME] Simple refactoring

[takahiro0327]

Some code was made into a function. The main purpose is to clean up duplicated code.
There are no functional changes.
Please merge if you like.

It will make it easier to hook specific processes from the outside and should make future changes somewhat easier.
If there are changes that add functions, such as ConvertNormalMap, for example, the changes should be limited to one or two places in each Controller.

[takahiro0327]

Sorry, I'll make some changes, just give me a minute.

[takahiro0327]

Fixes are done.
Please review.

[takahiro0327]

Thanks for the merge.
If you plan to version or release ME, give me a few days.
I think I'll put in a fix for the problem with the reset button not working if a shader not in the shader list was the initial selection.

[takahiro0327]

@ManlyMarco
Feel free to bump up the version or release.

It turns out that there are some difficult issues involved. Like mixing up shaders with the same name. It's going to be hard to reliably revert to the original shaders unless I can get some dirty code between them. I give up for now.

[ManlyMarco]

@takahiro0327 Got it, thanks for letting me know. I'll probably make a release around the weekend.