Consider using more numeric types

[keiravillekode]

Here is an estimate of how many exercise stubs use the various numeric types:

0 Byte
0 Cardinal
0 Comp
0 Currency
0 Extended
0 Longword
0 Real
0 Shortint
0 Smallint
1 Int64
1 QWord
1 Single
2 Double
2 Longint
2 Word
23 Integer

Perhaps some of the exercises currently using Integer can be changed so students gain experience with more numeric types. Alternatively, the less used numeric types can be kept in mind when adding future exercises.