#536 proper clearing of cleared config values

reactor-plc/config/system.lua

@@ -450,7 +450,8 @@ function system.create(tool_ctl, main_pane, cfg_sys, divs, style, exit)
     end
 
     local function save_and_continue()
-        for k, v in pairs(tmp_cfg) do
+        for _, field in ipairs(fields) do
+            local k, v = field[1], tmp_cfg[field[1]]
             if v == nil then settings.unset(k) else settings.set(k, v) end
         end
 

reactor-plc/startup.lua

@@ -18,7 +18,7 @@ local plc       = require("reactor-plc.plc")
 local renderer  = require("reactor-plc.renderer")
 local threads   = require("reactor-plc.threads")
 
-local R_PLC_VERSION = "v1.8.4"
+local R_PLC_VERSION = "v1.8.5"
 
 local println = util.println
 local println_ts = util.println_ts