Clever-f.

Frees up ; to be mapped to :.  Not sure if I like f et al leaving current
line, might change that setting.
Map ; to : to save shifting.

Also add a leader mapping for :A, since ;A still requires a shift.
Working against years of muscle memory here, we'll see how this goes...
Remove ycm settings that drifted back to defaults.
Group keymaps with related plugins.
Clean up columns for 8 space tabstop.