Document const statement

Author: Sainan

docs/QoL Improvements/Let Alias For Local.md

@@ -0,0 +1,36 @@
+Pluto introduces 2 optional shorthands for the `local` statement.
+
+## Let
+
+To enable the `let` keyword, simply do:
+```pluto
+pluto_use let
+```
+
+The usage is exactly the same as the `local` keyword.
+
+However, note that this will make `let` a reserved keyword, so you can't name any variables as such.
+If this is causing ambiguities in your script, you can disable it again after you're done with it:
+```pluto
+pluto_use let = false
+```
+
+## Const
+
+To enable the `const` keyword, simply do:
+```pluto
+pluto_use const
+```
+
+This allows you to do the following:
+```pluto
+const meaning = 42
+```
+As a shorthand for:
+```pluto
+local meaning <const> = 42
+```
+
+## For Integrators
+
+You can enable `let` and `const` in your Pluto environment by default by defining the `PLUTO_USE_LET` and `PLUTO_USE_CONST` macros in `luaconf.h` or your build config.

docs/QoL Improvements/Local Aliases.md

@@ -13,7 +13,7 @@ Prism.languages.pluto = {
 	},
 	'boolean': /\b(?:true|false)\b/,
 	'number': /\b([\d][\d_]+|(0x[a-f\d]+)|(0b[01]+))(?:\.[a-f\d]*)?(?:p[+-]?\d+)?\b|\b\d+(?:\.\B|(?:\.\d*)?(?:e[+-]?\d+)?\b)|\B\.\d+(?:e[+-]?\d+)?\b/i,
-	'keyword': /\$|\b(?:and|as|class|pluto_class|enum|begin|break|do|else|elseif|end|for|function|goto|if|in|local|new|not|or|repeat|return|static|then|until|while|continue|switch|case|default|pluto_switch|pluto_continue|extends|export|pluto_export|pluto_use|public|private)\b/,
+	'keyword': /\$|\b(?:and|as|class|pluto_class|enum|begin|break|do|else|elseif|end|for|function|goto|if|in|local|new|not|or|repeat|return|static|then|until|while|continue|switch|case|default|pluto_switch|pluto_continue|extends|export|pluto_export|pluto_use|public|private|const)\b/,
 	'variable': /\b(?:self|parent|pluto_parent)\b/,
 	'operator': [
 		/[-+*%^&|#]|\/\/?|<[<=]?|>[>=]?|[=~]=?|\:=|\?|(?<!\w)\:|\?\.|instanceof/,