Fix (hopefully) library dependency resolution.

Installing libs is now enabled, hardcoded.
Enable -Wall for all builds.
Fix many warnings and latent bugs.

depends/settings/include/keyring.h

@@ -33,6 +33,11 @@
 class LIBSETTINGS_EXPORT Keyring
 {
 public:
+	/**
+	 * @brief virtual dtor
+	 */
+	virtual ~Keyring() {};
+
 	/**
 	 * @brief the System Keyring instance
 	 * @return the Keyring instance

depends/settings/src/stubkeyring.h

@@ -24,6 +24,11 @@
 class StubKeyring : public Keyring
 {
 public:
+	/**
+	 * @brief virtual dtor
+	 */
+	virtual ~StubKeyring() {};
+
 	virtual bool storePassword(QString service, QString username, QString password);
 	virtual QString getPassword(QString service, QString username);
 	virtual bool hasPassword(QString service, QString username);