refs #1151 (on ModelicaStrings.c):
 * added the {{{MODELICA_EXPORT}}} define
 * renamed jump label {{{error}}} to {{{Modelica_ERROR}}} (as previously was done in ModelicaInternal.c)
 * replaced {{{sscanf}}} by calls to {{{strtod}}}/{{{strtol}}}. As a side effect: There now is no longer a dependency on {{{NO_FILE_SYSTEM}}} as {{{strtod}}}/{{{strtol}}} are defined in stdlib.h (whereas {{{sscanf}}} is in stdio.h). That means that on target platforms where ''Modelica.Utilities.Strings.scanReal'' and ''Modelica.Utilities.Strings.scanInteger'' previously failed due to a missing file system (e.g. dSPACE, xPC) it is now also supported.
 * avoid locale dependency of string to number conversion

git-svn-id: https://svn.modelica.org/projects/Modelica/trunk@6670 7ce873d0-865f-4ce7-a662-4bb36ea78beb