Read most protocol params from common/params.json

* Add params package with exported variables generated from
  github.com/ethereum/common/blob/master/params.json
* Use params package variables in applicable places
* Add check for minimum gas limit in validation of block's gas limit
* Remove common/params.json from go-ethereum to avoid
  outdated version of it

core/vm/common.go

@@ -20,8 +20,6 @@ const (
 	JitVmTy
 	MaxVmTy
 
-	MaxCallDepth = 1025
-
 	LogTyPretty byte = 0x1
 	LogTyDiff   byte = 0x2
 )