logging verbosity; series label attributes

• feat(log): configurable logging verbosity; fixes #134 c18cf9b
• feat(chart): directly use ChartDataLabelAttributes with chart series styles 8ec1647
• feat(chart): modifiy cahrt series datalabel solidFill color 3bf517c
• fix(table): do not expand cells in default table 7eb8809
• chore(shape): replace/remove shape placeholders properly 4d6c1ea
• test(image): add test image with special characters in filename 5f860c1
• fix(image): slugify external image name to prevent issues with special characters b62300f
• chore(doc): troubleshooting chart data 70a9ff2
• fix(table): always use first row as template for new rows; see #63 5a6b406

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v0.6.0...v0.6.1