Fix warnings on non-static data member initializers (C++11 feature)

We're not formally using C++11 yet so those trigger compilation warnings
(at least with GCC 5):

./main/input_default.h:122:30: warning: non-static data member initializers only available with -std=c++11 or -std=gnu++11
  CursorShape default_shape = CURSOR_ARROW;
                              ^

Note: We may allow those eventually (especially for non-int static const),
but most of current occurrences were inconsistent with all other classes.

See also http://www.stroustrup.com/C++11FAQ.html#member-init

editor/plugins/spatial_editor_plugin.h

@@ -86,7 +86,7 @@ public:
 
 	Vector<Vector3> handles;
 	Vector<Vector3> secondary_handles;
-	float selectable_icon_size = -1.0f;
+	float selectable_icon_size;
 	bool billboard_handle;
 
 	bool valid;

editor/spatial_editor_gizmos.cpp

@@ -715,6 +715,7 @@ EditorSpatialGizmo::EditorSpatialGizmo() {
 	instanced = false;
 	spatial_node = NULL;
 	gizmo_plugin = NULL;
+	selectable_icon_size = -1.0f;
 }
 
 EditorSpatialGizmo::~EditorSpatialGizmo() {

main/input_default.cpp

@@ -636,6 +636,7 @@ InputDefault::InputDefault() {
 	emulate_mouse_from_touch = false;
 	mouse_from_touch_index = -1;
 	main_loop = NULL;
+	default_shape = CURSOR_ARROW;
 
 	hat_map_default[HAT_UP].type = TYPE_BUTTON;
 	hat_map_default[HAT_UP].index = JOY_DPAD_UP;

main/input_default.h

@@ -119,7 +119,8 @@ class InputDefault : public Input {
 	SpeedTrack mouse_speed_track;
 	Map<int, Joypad> joy_names;
 	int fallback_mapping;
-	CursorShape default_shape = CURSOR_ARROW;
+
+	CursorShape default_shape;
 
 public:
 	enum HatMask {

modules/visual_script/visual_script_editor.cpp

@@ -3496,6 +3496,7 @@ VisualScriptEditor::VisualScriptEditor() {
 		clipboard = memnew(Clipboard);
 	}
 	updating_graph = false;
+	seq_connect = false;
 
 	edit_menu = memnew(MenuButton);
 	edit_menu->set_text(TTR("Edit"));

modules/visual_script/visual_script_editor.h

@@ -37,6 +37,7 @@
 #include "scene/gui/graph_edit.h"
 #include "visual_script.h"
 #include "visual_script_property_selector.h"
+
 class VisualScriptEditorSignalEdit;
 class VisualScriptEditorVariableEdit;
 
@@ -159,7 +160,7 @@ class VisualScriptEditor : public ScriptEditorBase {
 	MemberType member_type;
 	String member_name;
 
-	bool seq_connect = false;
+	bool seq_connect;
 
 	PortAction port_action;
 	int port_action_node;

modules/visual_script/visual_script_property_selector.cpp

@@ -721,6 +721,7 @@ VisualScriptPropertySelector::VisualScriptPropertySelector() {
 	search_options->set_hide_root(true);
 	search_options->set_hide_folding(true);
 	virtuals_only = false;
+	seq_connect = false;
 	help_bit = memnew(EditorHelpBit);
 	vbc->add_margin_child(TTR("Description:"), help_bit);
 	help_bit->connect("request_hide", this, "_closed");

modules/visual_script/visual_script_property_selector.h

@@ -63,8 +63,7 @@ class VisualScriptPropertySelector : public ConfirmationDialog {
 	ObjectID script;
 	Object *instance;
 	bool virtuals_only;
-
-	bool seq_connect = false;
+	bool seq_connect;
 
 	void _item_selected();
 

servers/audio/audio_stream.h

@@ -122,7 +122,7 @@ class AudioStreamPlaybackMicrophone : public AudioStreamPlaybackResampled {
 	GDCLASS(AudioStreamPlaybackMicrophone, AudioStreamPlayback)
 	friend class AudioStreamMicrophone;
 
-	const int MICROPHONE_PLAYBACK_DELAY = 256;
+	static const int MICROPHONE_PLAYBACK_DELAY = 256;
 
 	bool active;
 	unsigned int input_ofs;

servers/audio/effects/audio_effect_record.h

@@ -49,7 +49,7 @@ class AudioEffectRecordInstance : public AudioEffectInstance {
 
 	bool is_recording;
 	Thread *io_thread;
-	bool thread_active = false;
+	bool thread_active;
 
 	Vector<AudioFrame> ring_buffer;
 	Vector<float> recording_data;
@@ -67,6 +67,9 @@ public:
 	void init();
 	virtual void process(const AudioFrame *p_src_frames, AudioFrame *p_dst_frames, int p_frame_count);
 	virtual bool process_silence();
+
+	AudioEffectRecordInstance() :
+			thread_active(false) {}
 };
 
 class AudioEffectRecord : public AudioEffect {