changelog/*.dd: get rid of custom macros

Updating manually: COREMODREF -> MREF and NOXREF -> REF_OBJECT_SHORT.

REF_OBJECT_SHORT is a new macro. I couldn't figure out a way to make the
generic REF macro work for references to object, so I've replaced OXREF and
NOXREF with this.

Deleting definitions of all obsolete macros.

changelog/2.068.1.dd

@@ -18,8 +18,7 @@ $(LI $(LNAME2 coverage-profile-config, Functions to configure coverage, profile,
 
     $(P While they have been accessible through `extern(C)` linkage
         for a while, the functions to configure coverage, profile, and
-        profile=gc reports where added to $(COREMODREF runtime,
-        core.runtime).
+        profile=gc reports where added to $(MREF core,runtime).
     )
 
     $(BOOKTABLE,

changelog/2.070.0.dd

@@ -59,7 +59,7 @@ $(LI $(LNAME2 typeinfo-initializer, `TypeInfo.init` has been renamed to
     `TypeInfo.initializer`.)
 
     $(P The method `TypeInfo.init` has been renamed to
-        $(NOXREF TypeInfo.initializer, TypeInfo.initializer) to resolve
+        $(REF_OBJECT_SHORT TypeInfo.initializer) to resolve
         a name clash with the type property $(GLINK2 property, init).
     )
 

changelog/changelog.ddoc

@@ -46,15 +46,7 @@ DMDBUGSFIXED2=$(LINK2 https://issues.dlang.org/buglist.cgi?chfieldto=$2$(AMP)que
 DRUNTIMEBUGSFIXED2=$(LINK2 https://issues.dlang.org/buglist.cgi?chfieldto=$2$(AMP)query_format=advanced$(AMP)chfield=resolution$(AMP)chfieldfrom=$1$(AMP)chfieldvalue=FIXED$(AMP)bug_severity=regression$(AMP)bug_severity=blocker$(AMP)bug_severity=critical$(AMP)bug_severity=major$(AMP)bug_severity=normal$(AMP)bug_severity=minor$(AMP)bug_severity=trivial$(AMP)bug_status=RESOLVED$(AMP)version=D2$(AMP)version=D1%20%26%20D2$(AMP)component=druntime$(AMP)resolution=FIXED$(AMP)product=D, Druntime Bugs Fixed)
 PHOBOSBUGSFIXED2=$(LINK2 https://issues.dlang.org/buglist.cgi?chfieldto=$2$(AMP)query_format=advanced$(AMP)chfield=resolution$(AMP)chfieldfrom=$1$(AMP)chfieldvalue=FIXED$(AMP)bug_severity=regression$(AMP)bug_severity=blocker$(AMP)bug_severity=critical$(AMP)bug_severity=major$(AMP)bug_severity=normal$(AMP)bug_severity=minor$(AMP)bug_severity=trivial$(AMP)bug_status=RESOLVED$(AMP)version=D2$(AMP)version=D1%20%26%20D2$(AMP)component=Phobos$(AMP)resolution=FIXED$(AMP)product=D, Phobos Bugs Fixed)
 
-STDMODREF = $(LINK2 $(ROOT_DIR)phobos/std_$1.html, $(D $2))
-COREMODREF = $(LINK2 $(ROOT_DIR)phobos/core_$1.html, $(D $2))
-XREF = $(LINK2 $(ROOT_DIR)phobos/std_$1.html#$2, $(D $2))
-CXREF = $(LINK2 $(ROOT_DIR)phobos/core_$1.html#$2, $(D $2))
-OXREF = $(LINK2 $(ROOT_DIR)phobos/object.html#$2, $(D $2))
-_=nested XREFs
-NXREF = $(LINK2 $(ROOT_DIR)phobos/std_$1.html#.$2, $(D $2))
-NCXREF = $(LINK2 $(ROOT_DIR)phobos/core_$1.html#.$2, $(D $2))
-NOXREF = $(LINK2 $(ROOT_DIR)phobos/object.html#.$2, $(D $2))
+REF_OBJECT_SHORT=$(LINK2 $(PHOBOS_PATH)object.html#.$1, $(D $1))
 
 PULL_REQUEST = $(LINK2 https://github.com/dlang/$1/pull/$2, $1#$2)
 DMDPR = $(PULL_REQUEST dmd,$1)

changelog/prerelease.ddoc

@@ -7,14 +7,4 @@ $(SMALL to be released $1, $2)
 $4
 )
 
-STDMODREF = $(LINK2 $(ROOT_DIR)phobos-prerelease/std_$1.html, $(D $2))
-COREMODREF = $(LINK2 $(ROOT_DIR)phobos-prerelease/core_$1.html, $(D $2))
-XREF = $(LINK2 $(ROOT_DIR)phobos-prerelease/std_$1.html#$2, $(D $2))
-CXREF = $(LINK2 $(ROOT_DIR)phobos-prerelease/core_$1.html#$2, $(D $2))
-OXREF = $(LINK2 $(ROOT_DIR)phobos-prerelease/object.html#$2, $(D $2))
-_=nested XREFs
-NXREF = $(LINK2 $(ROOT_DIR)phobos-prerelease/std_$1.html#.$2, $(D $2))
-NCXREF = $(LINK2 $(ROOT_DIR)phobos-prerelease/core_$1.html#.$2, $(D $2))
-NOXREF = $(LINK2 $(ROOT_DIR)phobos-prerelease/object.html#.$2, $(D $2))
-
 PHOBOS_PATH=$(ROOT_DIR)phobos-prerelease/