Massive architectural rework

This commit massively overhauls the project's structure to simplify
development. Most parts are now correctly compartmentalized and
dependencies are passed in a sane way rather than global variables
galore xd.

pkg/API/info.go

@@ -0,0 +1,8 @@
+package API
+
+type Info struct {
+	// an int between 0 and 9 that represents the compression level, 0 being no compression, 9 being maximum compression
+	CompressionLevel int `json:"compression_level"`
+	// the version of the daemon (see pkg/version.go)
+	Version string `json:"version"`
+}