[RFC] Remove build phases

As discussed today between @matz3, @tommyvinhlam, @codeworrior, @RandomByte

Build phases would allow for more precise extensibility of a types build
execution. Mainly scenarios where only a single task should be replaced
or added could overwrite one of the build phases to hook in-between of
certain sets of tasks.

Instead, they will have to overwrite the whole build function containing
all tasks. The main reason for this decision is the lack of known
extensibility use-cases. Therefore we do not want to decide on the
naming and semantics of any build phases yet as changing them later on
will hardly be possible.

Author: RandomByte

rfcs/0001-type-extensibility.md

@@ -22,40 +22,16 @@ Multiple UI5 projects may require the same kind of "customized" build. Therefore
 
 ## Detailed design
 ### Extensibility of types
-Leverage the existing mechanism of types (currently for application and library), allow for a custom type and do the necessary adaption via regular JS language features (i.e. object-orientation, deriving and overriding).
-
-The `AbstractBuilder` (as well as any subclass-implementation) offers a set of functions which can be overwritten.
-
-#### Combined list of tasks executed by application- and library types
-- replaceCopyright
-- replaceVersion
-- buildThemes
-- generateLibraryPreload
-- createDebugFiles
-- uglify
-- generateFlexChangesBundle
-- generateManifestBundle
-- generateAppPreload
-- generateStandaloneAppBundle
-- generateVersionInfo
-
-#### Functions of the `AbstractBuilder` ("Phases")
-1. preprocess()
-    - replaceCopyright
-    - replaceVersion
-1. process()
-    - createDebugFiles()
-    - buildThemes()
-1. bundle()
-1. postprocess() / optimize()
-    - uglify()
+Leverage the existing mechanism of types (currently for application and library), allow for a custom type and do the necessary adaption via regular JavaScript language features (i.e. object-orientation, deriving and overriding).
+
+The `AbstractBuilder` (as well as any subclass-implementation) offers a set of functions which can be overwritten. Mainly the `build` function.
 
 A custom types `Builder`-module shall extend another types builder or the generic `AbstractBuilder` and overwrite relevant functions:
 ```js
 class MyCustomBuilder extends AbstractBuilder {
-    bundle() {
-        super.bundle();
-        myCustomBundle();
+    build() {
+        super.build();
+        myCustomBuildTask();
     }
 }
 ```