[LyX/master] Merge files Text{,2,3}.cpp

[Jean-Marc Lasgouttes]

commit 43b24085fb90873f3a7803a6684d359454a4f3cd
Author: Jean-Marc Lasgouttes <lasgouttes at lyx.org>
Date:   Thu May 4 15:21:02 2023 +0200

    Merge files Text{,2,3}.cpp
    
    This is done at the end of the release cycle to avoid backporting issues.
    
    The goal is to simplify development, since it was difficult to guess
    in which file a given method could be found.
    
    There is some effect on compilation time, but it is not too bad:
    
    * before merge
    
      lapinot: time make Text.o Text3.o Text2.o
        CXX      Text.o
        CXX      Text3.o
        CXX      Text2.o
    
      real	0m32,504s
      user	0m31,027s
      sys	0m1,446s
      lapinot: rm Text*.o
      lapinot: time make -j8 Text.o Text3.o Text2.o
        CXX      Text.o
        CXX      Text3.o
        CXX      Text2.o
    
      real	0m21,282s
      user	0m32,661s
      sys	0m1,424s
    
    * after merge
    
      lapinot: time make Text.o
        CXX      Text.o
    
      real	0m26,731s
      user	0m25,706s
      sys	0m1,020s

 src/Makefile.am           |    2 -
 src/Text.cpp              | 4794 ++++++++++++++++++++++++++++++++++++++++++++-
 src/Text2.cpp             | 1013 ----------
 src/Text3.cpp             | 3866 ------------------------------------
 src/insets/InsetFloat.cpp |    2 +-
 5 files changed, 4785 insertions(+), 4892 deletions(-)