render in terminal via blockish

[yazgoo]

• adds terminal rendering w/ blockish (-t flag)
• handles input w/ crossterm_input

video demos:

zelda: https://www.youtube.com/watch?v=ou_4WSuYRHk pokemon yellow: https://youtu.be/XcrkZnIS1lM

[mohanson]

I found that you have removed the WIP tag, but it still seems to be doing some work. If the PR is ready, please @ me, I will test and check it.

Thank you for your work.

[yazgoo]

@mohanson yep, the PR is ready :)

[mohanson]

@yazgoo

1. Please fix their build warnings:

   
   warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string()
   --> src\main.rs:128:26
   |
   128 |         None => {let _ = execute!(stdout(),terminal::EnterAlternateScreen);},
   |                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
   = note: `#[warn(deprecated)]` on by default
   = note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string() --> src\main.rs:161:25	161	let _ = execute!(stdout(),cursor::MoveTo(0,0));	^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

= note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

warning: use of deprecated item 'std::error::Error::description': use the Display impl or to_string() --> src\main.rs:227:26	227	None => {let _ = execute!(stdout(),terminal::LeaveAlternateScreen);},	^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

= note: this warning originates in a macro (in Nightly builds, run with -Z macro-backtrace for more info)

warning: 3 warnings emitted

2. This UI does not work well on windows, you need to fix it, or simply disable the use of terminal mode on windows, both ok.

![image](https://user-images.githubusercontent.com/12387889/85964954-df1f9c80-b9ed-11ea-801c-fd0ea88e575e.png)

[yazgoo]

Thanks !