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/assert.untouched.wat

@@ -7,11 +7,11 @@
  (data (i32.const 32) "\0c\00\00\00m\00u\00s\00t\00 \00b\00e\00 \00t\00r\00u\00e\00")
  (table $0 1 funcref)
  (elem (i32.const 0) $null)
- (global $HEAP_BASE i32 (i32.const 60))
+ (global $~lib/memory/HEAP_BASE i32 (i32.const 60))
  (export "memory" (memory $0))
  (export "table" (table $0))
  (start $start)
- (func $start (; 1 ;) (type $_)
+ (func $start:assert (; 1 ;) (type $_)
   (local $0 i32)
   i32.const 1
   i32.eqz
@@ -107,6 +107,9 @@
    unreachable
   end
  )
- (func $null (; 2 ;) (type $_)
+ (func $start (; 2 ;) (type $_)
+  call $start:assert
+ )
+ (func $null (; 3 ;) (type $_)
  )
 )