[hansva]

…ow, fixes #9350

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[bamaer]

Thanks @hansva, LGTM.

What I checked:

• Built the plugin and ran its unit tests: 21 pass.
• Compared TokenTemplate with the old TokenReplacingReader on 300,000 random templates: nine marker pairs, including overlapping ones (%%/%%, aba/a), plus unclosed and unknown tokens, null values and values that contain markers. Same output in every case.
• Timing, 3,200-character template with 3 tokens, 20,000 rows: 4.8 s before, 40 ms after.

Not run: integration test 0094.