Make Array_initialize block accept symbolic constants

[PropGit]

Similar to Issue #1573, let's make the array initialize block accept a symbolic constant or constant expression.

[MatzElectronics]

Unlike the string_variable_length block, this one would require the creation of a new block or the addition of a dropdown that lets you specify how you want to define it - number of constant. OR change it to a dropdown with some predefined values, other, and named constants all together like below, and then if they choose other, it changes to a number field:

• 5
• 10
• 20
• other
• CONSTANT1
• CONSTANT2 ...etc.