Fix: Binary Maths (#82)

* move max num length to config library

* getting there

* its working lol

* cleaned up pr

* more cleaning

* fixed linter

* began scriptnum removal

* rewrite scriptnumber entirely

* use afterGenesis flag

* more cleanups

* purged all refs to makeScriptNum

* even more cleanups

* shortened some code

* made the shifts on big.Int clearer with comments

bscript/interpreter/config.go

@@ -3,6 +3,7 @@ package interpreter
 import "math"
 
 type config interface {
+	AfterGenesis() bool
 	MaxOps() int
 	MaxStackSize() int
 	MaxScriptSize() int
@@ -24,6 +25,14 @@ const (
 type beforeGenesisConfig struct{}
 type afterGenesisConfig struct{}
 
+func (a *afterGenesisConfig) AfterGenesis() bool {
+	return true
+}
+
+func (b *beforeGenesisConfig) AfterGenesis() bool {
+	return false
+}
+
 func (a *afterGenesisConfig) MaxStackSize() int {
 	return math.MaxInt32
 }