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[BREAKING] Bundling: Enforce usage of sap.ui.predefine instead function wrappers (#1021)

Up until UI5 Tooling v3, the bundle option "usePredefineCalls" defaults
to "false" and has to be activated explicitly in a custom bundle
configuration.
For default bundles, such as Component-preload or self-contained bundle
(sap-ui-custom.js), there is no way to use the option apart from
re-defining the whole bundle via custom bundle definition.

With UI5 Tooling v4 bundles are generated with the usage
sap.ui.predefine calls instead of the former default function wrapper.
This leads to smaller bundle sizes and less overhead at runtime.

As the option only affects the internal handling of bundling without
affecting the actual users,
the option is removed completely, instead of just changing the default
value of the option.

Documentation update covered in
https://github.com/SAP/ui5-tooling/pull/957.

JIRA: CPOUI5FOUNDATION-760

BREAKING CHANGE:
Created bundles use sap.ui.predefine instead function wrappers. For
projects this is a compatible change. Only the produced bundle content
changes.

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