Add Clam plugin

A lightweight Vim plugin for working with shell commands.

https://github.com/sjl/clam.vim
Add Markdown support to Tagbar
Revert "Better implementation of :w!! (save file as sudo)"

This reverts commit bb63fbd311e72e087cb2640703fb8bc8e9f784a8.

This was a complete fail. It does a different thing.
Fix indentation in vimrc
Don't list backup and tags files in netrw
Use full name of options
Use all kind of EOLs by default
Ignore included files in completion
Remap [Y] to yank until end of line
Use <C-l> to clear highlighting of search
Don't give intro message
Show as much as possible of the last line
Save uppercase variables in viminfo

Useful for scripts.
Change name of local host vimrc

Use local.vim instead of vimrc_mine.vim.
Redefine unprintable characters

- Check if the encoding support utf-8.
- Use their four hex bytes representation.
Put swap and backup files in ~/.cache/vim
Use persistent undo
Merge remote-tracking branch 'upstream/master'

Conflicts:
	vimrc