First implemenation of <mouse> in rc.xml

Can successfully parse the following XML and and implement the action:

<mouse>
    <context name="TitleBar">
        <mousebind button="Left" action="DoubleClick">
            <action name="ToggleMaximize"/>
        </mousebind>
    </context>
</mouse>

The XML parsing code for this looks A LOT different than the already
existing XML parsing code. It may have to be reworked

include/config/mousebind.h

@@ -0,0 +1,41 @@
+#ifndef __LABWC_MOUSEBIND_H
+#define __LABWC_MOUSEBIND_H
+
+#include <wayland-util.h>
+
+enum mouse_context {
+	MOUSE_CONTEXT_TITLEBAR,
+	MOUSE_CONTEXT_NONE
+};
+
+enum mouse_button {
+	/*
+	 * These values match the values returned by button event->button and were
+	 * obtained experimentally
+	 */
+	MOUSE_BUTTON_LEFT = 272,
+	MOUSE_BUTTON_RIGHT = 273,
+	MOUSE_BUTTON_MIDDLE = 274,
+	MOUSE_BUTTON_NONE = -1
+};
+
+enum action_mouse_did {
+	MOUSE_ACTION_DOUBLECLICK,
+	MOUSE_ACTION_NONE
+};
+
+struct mousebind {
+	enum mouse_context context; /* ex: titlebar */
+	enum mouse_button button; /* ex: left, right, middle */
+	enum action_mouse_did mouse_action; /* ex: doubleclick, press, drag, etc */
+	const char* action; /* what to do because mouse did previous action */
+	const char* command;
+	struct wl_list link;
+};
+
+struct mousebind*
+mousebind_create(const char* context_str, const char* mouse_button_str,
+		const char* action_mouse_did_str, const char* action,
+		const char* command);
+
+#endif /* __LABWC_MOUSEBIND_H */