Added back some functionality to the sequencer

- removed static vars _last_seq, last_imagename and last_sounddir, replacing them with with vars in the "Editing" struct. didnt manage to get the active sequence to load so currently thats lost when loading.
- removed flag SEQ_ACTIVE
- Added operators cut, mute, unmute, deselect_all, select_invert, select, select_more, select_less, select_pick_linked, select_linked and borderselect.

source/blender/editors/space_sequencer/sequencer_intern.h

@@ -47,8 +47,54 @@ void drawseqspace(const struct bContext *C, struct ARegion *ar);
 int check_single_seq(struct Sequence *seq);
 int seq_tx_get_final_left(struct Sequence *seq, int metaclip);
 int seq_tx_get_final_right(struct Sequence *seq, int metaclip);
+void seq_rectf(struct Sequence *seq, struct rctf *rectf);
 void boundbox_seq(struct Scene *scene, struct rctf *rect);
 struct Sequence *get_last_seq(struct Scene *scene);
+struct Sequence *find_nearest_seq(struct Scene *scene, struct View2D *v2d, int *hand, short mval[2]);
+struct Sequence *find_neighboring_sequence(struct Scene *scene, struct Sequence *test, int lr, int sel);
+void deselect_all_seq(struct Scene *scene);
+void recurs_sel_seq(struct Sequence *seqm);
+
+void set_last_seq(struct Scene *scene, struct Sequence *seq);
+
+
+/* operators */
+struct wmOperatorType;
+struct wmWindowManager;
+void SEQUENCER_OT_cut(struct wmOperatorType *ot);
+void SEQUENCER_OT_mute(struct wmOperatorType *ot);
+void SEQUENCER_OT_unmute(struct wmOperatorType *ot);
+void SEQUENCER_OT_deselect_all(struct wmOperatorType *ot);
+void SEQUENCER_OT_select(struct wmOperatorType *ot);
+void SEQUENCER_OT_select_more(struct wmOperatorType *ot);
+void SEQUENCER_OT_select_less(struct wmOperatorType *ot);
+void SEQUENCER_OT_select_linked(struct wmOperatorType *ot);
+void SEQUENCER_OT_select_pick_linked(struct wmOperatorType *ot);
+void SEQUENCER_OT_borderselect(struct wmOperatorType *ot);
+void SEQUENCER_OT_select_invert(struct wmOperatorType *ot);
+
+/* RNA enums, just to be more readable */
+enum {
+    SEQ_LEFT,
+    SEQ_RIGHT,
+};
+enum {
+    SEQ_CUT_SOFT,
+    SEQ_CUT_HARD,
+};
+enum {
+    SEQ_SELECTED,
+    SEQ_UNSELECTED,
+};
+
+/* defines used internally */
+#define SEQ_ALLSEL	(SELECT+SEQ_LEFTSEL+SEQ_RIGHTSEL)
+#define SEQ_DESEL	~SEQ_ALLSEL
+#define SCE_MARKERS 0 // XXX - dummy
+
+/* sequencer_ops.c */
+void sequencer_operatortypes(void);
+void sequencer_keymap(struct wmWindowManager *wm);
 
 /* sequencer_scope.c */
 struct ImBuf *make_waveform_view_from_ibuf(struct ImBuf * ibuf);