New template format

[deviantfero]

I will be changing up a few things around, there are some breaking changes, so I think this is indeed worthy of a major version release, here's a checklist of things that I'm working on:

• use pywal's template format (python's format strings)
• leverage pywal's Color class and conversions
• integrate a upgrade option in wpgtk to help users with custom templates migration
• update user defined keywords so they work with the new format
• port all templates to new format to install under wpg-install.sh
• remove as much duplicated code as I can
• add option to auto-adjust on theme generation
• order command line arguments in a more logical manner
• remove old options that are no longer relevant (openbox, tint2) they will reload as long as they're actively running
• add dark variant for flattrcolor
• update documentation
• do a small video on new template format
• allow the reset of a theme using GUI and CLI

Now for the fun part (breaking changes)

Basically, the breaking changes come from the fact that the template format will change, I provide an example below:

#<COLOR8> becomes {color8}
#<COLORACT> becomes {active}
#<COLORIN> becomes {inactive}

if you have normal braces {{
   you will need to escape them like this
}}

but this means you can do things like: 
{color8}                -> #ffffff
{color8.octal}          -> #77777777
{active.rgb}            -> 255, 255, 255
{userdefinedcolor.rgb}  -> 0, 0, 0
#BA{color8.strip}       -> #BAffffff