Move Kmain into its own package

This allows us to keep the error definition in the kernel package
without causing circular import errors

Makefile

@@ -52,7 +52,7 @@ go.o:
 	@# with slashes we create a global symbol alias for kernel.Kmain
 	@echo "[objcopy] creating global symbol alias 'kernel.Kmain' for 'github.com/achilleasa/gopher-os/kernel.Kmain' in go.o"
 	@objcopy \
-		--add-symbol kernel.Kmain=.text:0x`nm $(BUILD_DIR)/go.o | grep "kernel.Kmain$$" | cut -d' ' -f1` \
+		--add-symbol kernel.Kmain=.text:0x`nm $(BUILD_DIR)/go.o | grep "kmain.Kmain$$" | cut -d' ' -f1` \
 		 $(BUILD_DIR)/go.o $(BUILD_DIR)/go.o
 
 binutils_version_check:

kernel/kmain/kmain.go

@@ -1,4 +1,4 @@
-package kernel
+package kmain
 
 import (
 	"github.com/achilleasa/gopher-os/kernel/hal"

stub.go

@@ -1,6 +1,6 @@
 package main
 
-import "github.com/achilleasa/gopher-os/kernel"
+import "github.com/achilleasa/gopher-os/kernel/kmain"
 
 var multibootInfoPtr uintptr
 
@@ -11,5 +11,5 @@ var multibootInfoPtr uintptr
 // A global variable is passed as an argument to Kmain to prevent the compiler
 // from inlining the actual call and removing Kmain from the generated .o file.
 func main() {
-	kernel.Kmain(multibootInfoPtr)
+	kmain.Kmain(multibootInfoPtr)
 }