FEAT: view's size-string function for measuring text without face object

[loziniak]

An attempt to deal with #4179.
I had problems with merging master into #4182. Now it's done on a separate branch.

[qtxie]

This PR is OK for Windows backend.

[qtxie]

gui/get-text-size cannot handle null face on Non-Windows platforms.

[loziniak]

thanks! working on it.

[loziniak]

I've tried to fix the issues and update the code for latest master. Unfortunately, there is a bug I cannot track down. With debug prints from commit 65befea, I get this under Linux, after compiling console-view in release mode:

% ./console-view__size-string
--== Red 0.6.4 ==-- 
Type HELP for starting information. 

>> size-string probe make font! [size: 20] "–––.."
make object! [
    name: none
    size: 20
    style: none
    angle: 0
    color: none
    anti-alias?: false
    shadow: none
    state: none
    parent: none
]

Hex dump from: 08805624h

08805624: 00000025 F7F24F84  000001C0 F7F24EB4  %...?O????..?N??
08805634: 00000007 00000000  F7F24F94 00000000  ?.......?O??....
08805644: 00000020 F7F24F84  000001C0 F7F24EB4   ...?O????..?N??
08805654: 00000005 00000000  F7F39180 00000000  ?.......????....
08805664: 00000005 00000000  F7F3911C 00000000  ?.......????....
08805674: 0000000B F7F41884  00000014 000008AE  ?...?????...??..
08805684: 0000000B F7F41884  00000014 000008AE  ?...?????...??..
08805694: 00000003 00000000  00000000 00000000  ?...............
font type1: 37 ptr: 08805624 val: 37
font type: 37
null-hfont 2
== 29x17

I don't understand why I get 37 (which is TYPE_PAIR) as a TYPE_OF(font). Any ideas?