types introduced

suggested changes and worker types

more types

more types and code style update

fix to run compilation very first time after plugin activation

Syntax updates2

update syntax to use const, let and this

refactor execution context

 - remix-analyzer@0.3.19
 - remix-astwalker@0.0.15
 - remix-debug@0.3.21
 - remix-lib@0.4.18
 - remix-simulator@0.1.9-alpha.11
 - remix-solidity@0.3.21
 - remix-tests@0.1.24
 - remix-url-resolver@0.0.10