"none" keyword for optionals + more memory fixes

september.plan

@@ -4,10 +4,13 @@
 - wrap up orm
 - fix vorum, migrate to orm
 - wrap up memory management
+- remove all compiler memory leaks
 - fix child <T> function calls
 + fix non-ascii rendering in gg (ä, å, etc)
 - cache all tokens once
 - enable vfmt
+- optimize the parser (reduce map lookups)
+- cache vlib (right now it's re-compiled every time)
 - fix openssl on older linux distros
 - chat.vlang.io
 - rewrite objective c code in v (ui_mac.m)
@@ -26,9 +29,6 @@
 + javascript backend
 - new playground with a v compiler running in the browser
 + o(log n) type lookup
-- remove all compiler memory leaks
-- optimize the parser (reduce map lookups)
 - prebuilt binaries for all platforms
-- cache vlib (right now it's re-compiled every time)
 - fix interfaces