Breaking change for statusline_separator field users | optimize statusline & make it overridable

added cmd fields for various plugins for example lspinstaller+lspconfig gets loaded only when a file opened but their commands can be run before a file is opened so I additionally lazy loaded them on their cmds too

lua/core/options.lua

@@ -12,7 +12,7 @@ g.did_load_filetypes = 0
 g.do_filetype_lua = 1
 
 opt.laststatus = 3 -- global statusline
-opt.statusline = config.plugins.options.statusline.config
+opt.statusline = config.ui.statusline.config
 opt.showmode = false
 
 opt.title = true