Add powerline fonts

There exist two powerline symbolsets,
one from powerline (current) and the other from vim-powerline.
powerline uses private use area;
vim-powerline uses unicode standard symbol area.

Ok, but why bother? Since some scripts still use old vim-powerline font.
Especially, "agnoster" theme of oh-my-zsh does.

* "PowerlineSymbols.otf" is made from powerline,
  `font/fontpatcher.py`.
  Contains poweline private use area symbols.
* "PowerlineSymbols.vim-powerline.otf" is made from
  old vim-powerline: https://github.com/Lokaltog/vim-powerline
  `fontpatcher/fontpatcher`.
  Contains vim-powerline symbols.
Enable powerline on vim
zsh: use agnoster theme
tmux: enable powerline
install.sh: fix export.sh path
tmx: default session name
vim: f7 to make
tmux: fix source-file powerline
vim: swap files use full pathname
Xmodmap: keysym Escape, Caps_Lock, Control_L
Xmodmap: mod1 -> Mod1

(cosmetic changes)
Xmodmap: Control_R to Hangul_Hanja