changed slider issue, fixed monitor bug, added basalt.isKeyDown(keys)

Slider: added setIndex() and changed setValue behaviour
Monitor: Changed monitor draw priority so input's cursor still shows (have to figure out why its even hiding)
added new function where you can check if a user is holding a key currently down

source/Installer.lua

@@ -0,0 +1,16 @@
+--[[
+To install basalt copy paste the following line to your computer:
+ 
+pastebin run ESs1mg7P
+ 
+---------------------------------------------
+Hi, this is the installer for the UI Framework basalt!
+currently its just a single file. In the near future i will split my project into multiple files and "compile" it to one single file on your computer.
+You are curious what basalt is? check out my github wiki: https://github.com/NoryiE/Basalt/wiki/
+----------------------------------------------
+]]
+local args = {...}
+ 
+local defaultFilePath = args[1] or "basalt.lua"
+ 
+shell.run("wget https://raw.githubusercontent.com/Pyroxenium/Basalt/master/basalt.lua "..defaultFilePath)