Removed `core.project_dir`

data/core/init.lua

···
 local core = {}
 
 
--- the following line has been added for temporary backwards-compatibility with
--- plugins. on the 1.05 release this will be removed:
-core.project_dir = "."
-
-
 local function project_scan_thread()
   local function diff_files(a, b)
     if #a ~= #b then return true end