Cody Weaver 1ca10a8669
[Theming] Update our theming extensions (#5945)
### Context
All of our theming targets should be `MDC<#Component>+Theming` but all files should be `MDC<#Component>+MaterialTheming.m/h`. We got out of sync and caught this early.

### The problem
Our targets and file names weren't correct in some cases

### The fix
Update our targets and files to be what we have decided as a team.
2018-12-10 14:16:37 -05:00
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