Convert all stdout/stderr prints to use Log functions

[ljbade]

There is still some code that writes to stdout/stderr instead of the Log functions. For example tile_parser.cpp

This means important error messages never make it to the log on Android and makes debugging harder.

So all code using some sort of print function needs to be found and changed to Log.

Also anywhere that throws a C++ exception needs to also print a Log::Error before it throws in case we don't catch the exception and we crash instead.

[ljbade]

Will make a branch on master for this.

[ljbade]

Still need to get on to this.

However I notice some more printfs have crept in, /cc @ansis

[tmpsantos]

@ljbade I can take this one as I'm working also on #882

[ljbade]

Cool @tmpsantos that would be awesome. I found their was a mix of C++ style cout/cerr and the various C APIs such as *printf and a few others.

You will probably want to regex the repo to find them all.

[ljbade]

@jfirebaugh after they have been converted, we will have to make sure everyone knows not to commit code not using the Log. I will try to keep an eye on this in PRs.