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docs: tidy up templates and fix font headings
This commit adds field initializers to the CFG for non-static constructors. For
example, in
```
class C
{
int Field1 = 0;
int Field2 = Field1 + 1;
int Field3;
public C()
{
Field3 = 2;
}
public C(int i)
{
Field3 = 3;
}
}
```
the initializer expressions `Field1 = 0` and `Field2 = Field1 + 1` are added
to the two constructors, mimicking
```
public C()
{
Field1 = 0;
Field2 = Field1 + 1;
Field3 = 2;
}
```
and
```
public C()
{
Field1 = 0;
Field2 = Field1 + 1;
Field3 = 3;
}
```
respectively. This means that we no longer have to synthesize calls, callables,
parameters, and arguments in the data flow library, so much of the work from
d1755500e4 can be simplified.
This file is now identical in all languages. Unifying this file led to
the following changes:
- The documentation spelling fixes and example from the C++ version
were copied to the other versions and updated.
- The steps through `NonLocalJumpNode` from C# were abstracted into a
`globalAdditionalTaintStep` predicate that's empty for C++ and Java.
- The `defaultTaintBarrier` predicate from Java is now present but empty
on C++ and C#.
- The C++ `isAdditionalFlowStep` predicate on
`TaintTracking::Configuration` no longer includes `localFlowStep`.
That should avoid some unnecessary tuple copying.
This class was copy-pasted in all `DataFlowN.qll` files without using
the identical-files system to keep the copies in sync. The class is now
moved to the `DataFlowImplN.qll` files.
This also has the effect of preventing recursion through first data flow
library copy for C/C++. Such recursion has been deprecated for over a
year, and some forms of recursions are already ruled out by the library
implementation.
