Add changelog entries

Author: Quirin Schroll

changelog/dmd.basic-vs-primary-type.dd

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+The term *basic type* is now *primary type*
+
+The parser now uses the term *primary type* for what used to be referred to as *basic type.*
+The term *basic type* is used specifically for type expressions that are not immediately recursive.
+
+A *basic type* is a *fundamental type* (those which have keywords)
+or a type given by an identifier, a `typeof`, a `mixin`, or a `__traits`.
+Absent from this list are `__vector` types and types spelled out using a qualifier and parentheses (e.g. `const(int)`).
+
+A *primary type* is a *basic type* or a `__vector` type or a qualified type.
+
+For the most part, *primary type* is the term you want to use and will see in error messages now.
+There are some corners where indeed a *basic type* is required.

changelog/dmd.const-base.dd

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+Specifying a qualified type as a base class or interface is an error now
+
+A type like `const(Object)` could be used as a base class in the base class list
+of a class or interface declaration or of an anonymous class object.
+There, qualifiers were simply ignored semantically.
+
+Explicitly qualifying types in base class lists is a parse error now.
+
+This only affects parsing.
+If a `mixin` or `typeof` or an identifier is used, nothing changes.
+If it resolves to a qualified type,
+the qualifier is ignored.
+---
+class C : const(Object) { } // Parse error now
+auto obj = new class const(Object) { }; // Parse error now
+---
+There is no deprecation period.
+The fix is to remove the unnecessary and misleading qualifier from your code.