Lua: refactor script api, more doc, add button for Open Lua Scripts Folder (#1588)

* lua manager: pass down the scripts folder to the instance instead of hard coding calls to the file manager everywhere
* lua: add open lua scripts folder button
* lua api: change script binding so that user cannot by mistake try to sleep or yield in a non script context

docs/lua/classes/script_util.md

@@ -0,0 +1,28 @@
+# Class: script_util
+
+Class for gta script utils, the instance is usually given to you.
+
+## Functions (2)
+
+### `yield()`
+
+Yield execution.
+
+**Exemple Usage:**
+```lua
+script_util:yield()
+```
+
+### `sleep(ms)`
+
+Sleep for the given amount of time, time is in milliseconds.
+
+- **Parameters:**
+  - `ms` (integer): The amount of time in milliseconds that we will sleep for.
+
+**Exemple Usage:**
+```lua
+script_util:sleep(ms)
+```
+
+