Rework resolver (#489)

* Rework IR and resolver to use nested lookup tables
* Integrate types into IR
* Make components prefer IR, slimmed down AST
* Implement `export *`
* Add `@lazy` annotation and remove `--noTreeShaking`
* Add `@start` annotation and remove magic `main`
* Related refactoring, cleanup and docs

tests/compiler/binary.optimized.wat

@@ -406,7 +406,7 @@
   local.get $0
   f64.mul
  )
- (func $start (; 4 ;) (type $_)
+ (func $start:binary (; 4 ;) (type $_)
   (local $0 i32)
   (local $1 i64)
   (local $2 f32)
@@ -749,7 +749,10 @@
   call $~lib/math/NativeMath.pow
   global.set $binary/F
  )
- (func $null (; 5 ;) (type $_)
+ (func $start (; 5 ;) (type $_)
+  call $start:binary
+ )
+ (func $null (; 6 ;) (type $_)
   nop
  )
 )