Add option to don't store window geometry

[damanis]

Is your feature request related to a problem? Please describe.
Window geometry stored in neovide-settings.json even then let g:neovide_remember_window_size = v:false.
As a result, neovide window always open on same place.
Now window dimensions properly calculated by font configuration, window position specified by window manager (in Linux), but restore geometry from neovide-settings.json override them.

Describe the solution you'd like
Just add configuration option to don't save and restore window geometry

[shaunsingh]

This should be fixed with #1119