mappings|init: Move init mappings to a function, only call when required | Show err message for init

because mappings.lua is called from multiple places, so there should't be any code that executes without calling a specific function

show error message when something fails in init.lua
makes no sense to not

rearrange plugin functions alphabetically, but keep misc at top

init.lua

@@ -4,5 +4,9 @@ local chad_modules = {
 }
 
 for i = 1, #chad_modules, 1 do
-   pcall(require, chad_modules[i])
+   if not pcall(require, chad_modules[i]) then
+      error("Error loading " .. chad_modules[i] .. "\n")
+   end
 end
+
+require("mappings").misc()