removed all messages from errors package. the strings are now hard coded
in place. the original reason for extracting the error strings like that
was (a) for redundancy and (b) for localisation possibilities. However,
in reality there is not much redundancy and since the project started
the scope of localisation is much larger (particularly due to the
addition of a GUI)
this is the first step. the next step is to remove the errors package
altogether. recent additions to Go mean that the functionality of the
errors package is no longer required. moreover, the original idea for
the errors package functions turns out not to have been as useful as
first appeared (the Error() functionality which makes sure no repeating
sub-strings occur is probably better achieved with static tooling).
one idea that comes from this which is quite interesting is the idea of
a curated error. that is, any error that has been "wrapped" as some
'generic' type. the IsAny() function in the errors package effectively
serves this purpose. we use that in one place in the input loop of the
debugger. not strictly necessary but nice to have so it would ideal
if we could remove the errors package but keep that idea.
the note about historical versions also being covered wasn't strictly
needed and was ugly. the LICENCE being in the root file from the very
first commit is sufficient.
the location of the configuration directory now depends on how the
binary is built. release versions of the binary will look for the
gopher2600 directory in the user's os configuration directory.
non-release versions will look for the .gopher2600 directory in the CWD.
paths.ResourcePath() will create the paths that don't exist
paths.ResourcePath() now clearly differentiates paths and files
added build target to the Makefile; disabled release target for now
- removed ErrorID, using the error message as the ID
- works just as well and simplifies maintenance
- the messages should be moved to the relevant packages OR to a
locale package. not sure which yet.
