Fix white space issues in mce code base

No functional changes.

Files where majority of lines are indented with tabulators are changed
so that every beginning of line uses tabulators for 8 character skips.
The rest of the files use only space characters for indentation.

Remove excess empty lines from all source files.

Make indentation levels uniform within each source file.

[mce] Fix white space issues in mce code base. Fixes JB#18915
Reduce complexity of iterating over list of allowed dim timeouts

By not using g_slist_nth_data() the list traversal complexity drops
from O(N²) to O(N).

Also return valid index even if the provided dim_timeout setting
is larger than the largest allowed dim timeout.
Merge pull request #164 from spiiroin/whitespace

Fix indetation and other white space issues