Fix or document Ubuntu compiler issues

[DJLevel3]

I have been having some issues with getting Oscilloscope to compile on Ubuntu, but I found workarounds and fixes for everything. This PR should fix everything or document the workarounds until a real fix comes.

[DJLevel3]

After fixing a bunch of stuff, it's done! I'm marking it ready fro review!

[DJLevel3]

Oops, it's not working. Don't merge yet.

[DJLevel3]

It works now!!! YAY!!! Ready to merge.

[DJLevel3]

Any updates? I don't have the permissions to merge a PR myself so I need someone who does to merge it for me. I tested the process from start to finish and it works perfectly.

[walksanatora]

im on arch, but if i pull from your branch
will it work

[walksanatora]

might i suggest possibly making the other dependicies a sub module
and fixing the compile paths
so that i dont have to remember to clone other repos

[kritzikratzi]

hey!

thanks for looking into it.

for the two problems with the addons i believe updating the submodules to the latest version fixes both (missing cstdio in liblaserdock, missing include guards in ofxNative, i believe @DJLevel3 fixed those) so both the remarks in the readme and the sed command is fortunately already obsolete.

i have a few busy days ahead of me, but i'm trying to not forget!

@DJLevel3 do you have the time to start a fresh PR where you update the submodules and pick the changes from the readme that are still relevant, so that it's a single commit that i can review?

i'm leaving this PR open either way for now.