Added support for enabling/disabling command based on the environment
Added support for enabling/disabling command based on the environment

Enabled only if current file syntax is 'XML' (with fallback support for 'Plain Text') and there are at least one character in the text selection regions.

Signed-off-by: Jeffrey Sadeli <7dc746dfc9c77500eb2828095a62c641fb7ba206@sadeli.com>

alek-sys/sublimetext_indentxml,alek-sys/sublimetext_indentxml