Implement custom procedures

[MegaApuTurkUltra]

Lots of people's 2.0 custom blocks won't make any sense when converted into the new format.

For example this:

Would presumably become something like this in the conversion from 2.0 to 3 format

Scratchers might get confused by things like this.

[tmickel]

The current implementation is a direct copy-paste from Blockly - the actual version is only in the earliest design stages, and is likely to look significantly different. @carljbowman

[tmickel]

From @TheBrokenRail:

Here's Some Issues I Found With The UI in procedure blocks/custom blocks

• Need Space Between Blocks In Block Palate
• Input Block Is Offset From Curser
• No Background For Warning About Standalone report block Needing To Be Used In a custom block definition
• Needs Proper UI for input Selection
• Gear And Warning Triangles should be maybe should be the same color as the blocks
• Use Define Instead of to
• Bottom of define with report is longer than top

[rachel-fenichel]

One more:

• Need to be able to add label text between inputs

[tmickel]

Yep, and inputs need types (number, string, boolean).

[towerofnix]

Don't forget default values for number/string inputs! That's implemented in the actual "blocks" part of Scratch 2.0 (though there's no UI for it atm).