StdLibs String methods

[jaredlll08]

[stanhebben]

Methods that should be supported built-in, or which are already supported:

• charAt: should already be possible with indexing
• chars: add to language as .chars property (if not already)
• compareTo: should be available (I'll need to check how)
• concat: use + operator
• contains: in operator
• equals: == operator
• length
• substring: use range indexing for this
• valueOf: already supported with casts

Methods which should be in stdlib:

• compareToIgnoreCase
• endsWith
• equalsIgnoreCase
• getBytes (we already have a function in stdlib for this, an ascii and utf-8 variant)
• indexOf (all 4 overloads)
• isBlank: add to stdlib as getter (.blank)
• isEmpty: add to stdlib as getter (.empty)
• join: add to stdlib as expansion on string[]
• lastIndexOf (all 4 overloads)
• repeat
• replace
• replaceFirst
• split (both with and without limit) (having a variant with just literal strings in stdlib would be nice. but no regexes yet. maybe a regex-supporting variant can be added as Java specific)
• startsWith
• strip
• stripLeading
• stripTrailing
• toLowerCase
• toUpperCase

Methods that should not be in the language or in stdlib, but can still be added to Java integration:

• JavaIntegration: Java-only String methods ZenCode#149

Methods that are redundant:

• copyValueOf
• subSequence: use substring instead
• toCharArray
• trim (use strip)