Break compiler out into its own package

cmd/fsplc/main.go

@@ -4,6 +4,7 @@ import "os"
 import "fmt"
 import "git.tebibyte.media/sashakoshka/fspl/cli"
 import "git.tebibyte.media/sashakoshka/fspl/entity"
+import "git.tebibyte.media/sashakoshka/fspl/compiler"
 import ferrors "git.tebibyte.media/sashakoshka/fspl/errors"
 
 func main () {
@@ -43,7 +44,7 @@ func main () {
 		application.Usage()
 	}
 	
-	compiler := new(Compiler)
+	compiler := new(compiler.Compiler)
 	compiler.Output       = output.Value
 	compiler.Optimization = optimization.Value
 	compiler.Format       = format.Value

compiler/compiler.go

@@ -1,4 +1,4 @@
-package main
+package compiler
 
 import "os"
 import "fmt"

compiler/doc.go

@@ -0,0 +1,3 @@
+// Package compiler is responsible for orchestrating the different FSPL
+// compilation stages, as well as invoking the LLVM IR compiler.
+package compiler