Port Daala stream analyzer to AV1.

This ports the wx-widgets stream analyzer from Daala to AV1.
Currently, this supports playback, zooming, and printing bit accounting
 statistics to stdout.
The configure script does not yet build the analyzer, to compile it:
 g++ -I. examples/analyzer.cc video_reader.c ivfdec.c tools_common.c \
 libaom.a `wx-config --cppflags` `wx-config --libs` -o analyzer

Change-Id: I0e4288d52a103850b255f226f398892cc50d29e8

configure

@@ -22,6 +22,7 @@ show_help(){
 Advanced options:
   ${toggle_libs}                  libraries
   ${toggle_examples}              examples
+  ${toggle_analyzer}              analyzer
   ${toggle_docs}                  documentation
   ${toggle_unit_tests}            unit tests
   ${toggle_decode_perf_tests}     build decoder perf tests with unit tests
@@ -381,6 +382,7 @@ CMDLINE_SELECT="
 
     libs
     examples
+    analyzer
     docs
     libc
     as
@@ -500,6 +502,9 @@ post_process_cmdline() {
 
 }
 
+# Enable accounting if building the analyzer
+enabled analyzer && soft_enable accounting
+
 
 process_targets() {
     enabled child || write_common_config_banner