Add Swaylock support

src/SwaybgProcess.h

@@ -1,33 +0,0 @@
-#pragma once
-
-#include <iostream>
-#include <sched.h>
-#include <string>
-#include <unistd.h>
-#include <sys/wait.h>
-
-#define SWAYBGPROCESS_BUFFER_SIZE 4094
-
-class SwaybgProcess {
-	public:
-
-	SwaybgProcess(const std::string& wallpaperPath, const std::string& output);
-
-	~SwaybgProcess();
-
-	void exec();
-
-	void kill();
-
-	private:
-
-	std::string wallpaperPath;
-	std::string output;
-	pid_t pid;
-	bool killed = true;
-
-	int fds[2]; // file descriptors for pipe
-	char buf[SWAYBGPROCESS_BUFFER_SIZE];
-	ssize_t nbytes;
-};
-