improved parameter validation

[Spongman]

this PR improves the parameter validation a little:

• it now handles array types (eg. Number[]) and checks the types of the array's elements.
• it checks object types (eg. p5.Color)
• it checks Constant values (eg. HSB|RGB, etc...)
• it checks Integer values are integral. (and updated doc comments where appropriate)
• it pre-calculates more of the work needed to do the validation, and caches the lookupParamDoc results. performance is significantly improved in debug.
• validation has been added to more p5 methods.
• the validation code & data.json is excluded from IS_MINIFIED builds, reducing the un-deflated size from 1,100KB to 389KB.

fixes #1329, #785

[Spongman]

it looks like everything changed in error_helpers.js but that because I had to split apart the parameter validation (which is conditional on IS_MINIFIED) and the top-level warning stuff (which is not). also, jslint is fussy about the ordering of functions inside {} blocks (but not elsewhere, for some reason).

[meiamsome]

This looks like good improvements. It may be worth cherry picking 68de25a and 464c2f5 from #2177 into this PR & then that PR can be rebased onto this.

[Spongman]

ok, this does the right thing with the argument count error. i fixed up some docs to accomodate.

i also added the location of the error in the message, which you can click on to navigate in chrome's devtools .

i'm not going to do any rebasing, because, for me at least, it always ends in tears.

[meiamsome]

Ah, that's good that 2bb7aa removed the need for that extra parameter to createCanvas! It's a shame that Travis has your account blacklisted and won't run the tests on this PR - perhaps you can give them a shout to un-blacklist you?

[Spongman]

travis? blacklisted? i have no idea what that is.

[meiamsome]

It's the thing that's supposed to automatically run tests on PRs to check they run fine. (The tick/cross next to the PR in the PR list)

Your PRs are marked as "abuse detected" here: https://travis-ci.org/processing/p5.js/requests
I'm not sure why, though, travis-ci/travis-ci#6942 says you should just email them to get it cleared up!

Either way, I'm just confirming this passes tests and afaics is ready for merge!

[Spongman]

i'm sorry if I messed up the merge, it seems like i have a love/hate relationship with git: it just loves to hate me.

[lmccart]

this is great, sorry it took so long to merge