Sort modules before binding, sort exports

[lukastaegert]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:
Resolves #2753

Description

This resolves #2753 and even improves tree-shaking results in some cases by sorting all modules by their execution order before binding variables to their definitions. When binding variables, some tree-shaking preparations are performed as well which do not work as well when the modules are execution in an order different from their execution order, resulting in more included code.

To also make the output more stable, readable, and less dependent on implementation details, exports are also sorted by name now.

[mislav]

Thank you for the fix! Confirmed that running patched rollup -c in a loop consistently produces the same result over and over.