cmus 2.6.0

Signed-off-by: Gregory Petrosyan <gregory.petrosyan@gmail.com>
Add mouse support

Add option mouse=true/false

Add bind keys:
- mlb_click,
- mlb_click_selected,
- mrb_click,
- mrb_click_selected,
- mouse_scroll_up,
- mouse_scroll_down
Add conditionals to format strings
Add format_treewin, format_treewin_artist, format_trackwin_album
Fix expr_free(NULL) and long format options
Add format_print_gbuf
Add get_global_fopts
Add format_print remote command
Add player info to get_global_fopts()
Add validation to format_print remote command
Add mouse scrolling & window toggling in blank space
Add run_only_safe_commands check
Add documentation
Add play count support
Merge pull request #156 from pavel-belikov/format_print_cmd

Format print remote command
Add format_statusline
Add statusline printing
Fix segfault
Add documentation
Fix typo