do not use 'portable' as a compile time option

Introduce the file core/start.lua to initialize applications variables

data/core/config.lua

@@ -1,5 +1,3 @@
-global {VERSION = "1.16.0"}
-
 local config = {}
 
 config.project_scan_rate = 5

data/core/start.lua

@@ -0,0 +1,17 @@
+-- this file is used by lite-xl to setup the Lua environment
+-- when starting
+VERSION = "1.16.0"
+
+SCALE = tonumber(os.getenv("LITE_SCALE")) or SCALE
+PATHSEP = package.config:sub(1, 1)
+EXEDIR = EXEFILE:match("^(.+)[/\\][^/\\]+$")
+
+local prefix = EXEDIR:match("^(.+)[/\\]bin$")
+DATADIR = prefix and (prefix .. '/share/lite-xl') or (EXEDIR .. '/data')
+USERDIR = HOME and (HOME .. '/.config/lite-xl') or (EXEDIR .. '/user')
+
+package.path = package.path .. ';' .. USERDIR .. '/?.lua'
+package.path = package.path .. ';' .. USERDIR .. '/?/init.lua'
+package.path = DATADIR .. '/?.lua;' .. package.path
+package.path = DATADIR .. '/?/init.lua;' .. package.path
+