simplify cxBufferAppend() because it does not need to care about flushing anymore default tip

improves cxBufferPutString() and adds cxBufferAppendString() - resolves #779

improves cxBufferTerminate()

fix missing error handling when terminating the string

add cxJsonToString() and cxJsonToPrettyString() - resolves #778

adds new CX_BUFFER_DO_NOT_FREE buffer flag

removes buffer flush and adds maximum capacity instead - resolves #185

add test for multiple consecutive line continuations

adjusts documentation regarding line continuation support - relates to #457

add CHANGELOG entry for the bug found by test issue #777

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