Updates gui to be an add-on rather than default build mode in makefile and build tags within code

Makefile

@@ -13,15 +13,14 @@ VERSION_HASH := $(shell git rev-list -1 HEAD)
 build:
 	${GOCMD} build -ldflags "-w -s -X main.VersionHash=${VERSION_HASH}" -o ${BINARY}
 
-.PHONY: nogui
+.PHONY: gui
 nogui:
-	${GOCMD} build -tags nogui -ldflags "-w -s -X main.VersionHash=${VERSION_HASH}" -o ${BINARY}
+	${GOCMD} build -tags gui -ldflags "-w -s -X main.VersionHash=${VERSION_HASH}" -o ${BINARY}
 
 .PHONY: install
 install: install-bin install-man clean
 
-.PHONY: install-bin
-install-bin: build
+install-bin: ${BINARY}
 	install -d ${DESTDIR}${BINDIR}
 	install -m 0755 ./${BINARY} ${DESTDIR}${BINDIR}
 

gui.go

@@ -1,4 +1,4 @@
-// +build !nogui
+// +build gui
 
 package main
 

guiStatic.go

@@ -1,4 +1,4 @@
-//+build !nogui
+//+build gui
 
 package main
 

noGuiStatic.go

@@ -1,4 +1,4 @@
-//+build nogui
+//+build !gui
 
 package main
 

nogui.go

@@ -1,4 +1,4 @@
-// +build nogui
+// +build !gui
 
 package main