[vim] use standard Unicode in statusline (airline)

The fonts patched with Powerline symbols are buggy and limited. Using
standard Unicode provides good looks and requires no fiddling with
fonts, which is less headache in terms of portability. If support for
the used Unicode symbols turns out to be too limited, they can be
changed to normal ASCII characters.

.gitmodules

@@ -1,6 +0,0 @@
-[submodule "resources/Menlo-for-Powerline"]
-	path = resources/Menlo-for-Powerline
-	url = https://github.com/abertsch/Menlo-for-Powerline.git
-[submodule "resources/powerline-consolas"]
-	path = resources/powerline-consolas
-	url = https://github.com/nicolalamacchia/powerline-consolas.git

resources/Menlo-for-Powerline

@@ -1 +0,0 @@
-Subproject commit 07e91f66786b3755d99dcfe52b436cf1c2355f38

resources/powerline-consolas

@@ -1 +0,0 @@
-Subproject commit fe97c6dda5996ba6cfd00bdb82c8211e4ac2a544

vimrc

@@ -76,8 +76,20 @@ set nocompatible
     highlight link taskpaperCancelled     Comment
     highlight link taskpaperComment       Normal
 
-    let g:airline_theme="solarized"
-    let g:airline_powerline_fonts = 1
+    if !exists('g:airline_symbols')
+        let g:airline_symbols = {}
+    endif
+    let g:airline_left_sep = ' '
+    let g:airline_right_sep = ' '
+    let g:airline_left_alt_sep = ''
+    let g:airline_right_alt_sep = ''
+    let g:airline_symbols.crypt = '☢'
+    let g:airline_symbols.paste = 'Ⓟ'
+    let g:airline_symbols.spell = '✔'
+    let g:airline_symbols.branch = '⎇'
+    let g:airline_symbols.readonly = ' ⃠'
+    let g:airline_symbols.linenr = '␤'
+    let g:airline_symbols.whitespace = '✗'
 
     colorscheme solarized
     filetype plugin indent on
@@ -152,3 +164,4 @@ augroup vimrc " {{{
 augroup END " }}}
 
 if filereadable(expand("~/.vimrc.local")) | source ~/.vimrc.local | endif
+