refactor(commands): separate commands and its core into two folders (#32)

- I think it would be better if one for commands only, one for the spec
handling core logic so people won't be confused by the core logic inside
the commands folder (cleaner I guess)
- Regen docs

commands/cc/premake.go

@@ -1,14 +1,14 @@
 package cc
 
 import (
-	"github.com/versenilvis/iris/commands/core"
+	"github.com/versenilvis/iris/spec"
 )
 
 func init() {
-	core.Register(&core.Spec{
+	spec.Register(&spec.Spec{
 		Name:        "premake",
 		Description: "The premake5.lua file",
-		Subcommands: []core.Subcommand{
+		Subcommands: []spec.Subcommand{
 			{Name: "clean", Description: "Remove all binaries and generated files"},
 			{Name: "vs2022", Description: "Generate Visual Studio 2022 project files"},
 			{Name: "vs2019", Description: "Generate Visual Studio 2019 project files"},
@@ -24,7 +24,7 @@ func init() {
 			{Name: "xcode4", Description: "Generate Apple Xcode 4 project files"},
 			{Name: "codelite", Description: "Generate CodeLite project files"},
 		},
-		Options: []core.Option{
+		Options: []spec.Option{
 			{Name: "--file", Description: "The premake5.lua file"},
 			{Name: "--debugger", Description: "Start MobDebug remote debugger. Works with ZeroBrane Studio"},
 			{Name: "--fatal", Description: "Treat warnings from project scripts as errors"},