Bump version to 0.2.29

[ainyan03]

Patch release. Bug fixes and small additions only; no API change.

Fixes

• Bus_SPI: SPI_USER_REG is restored before releasing the bus lock (Bus_SPI: restore SPI_USER_REG before releasing the bus lock #271)
• Bus_SPI: spi_bus_config_t is zero-initialized, so the dma_burst_size added in ESP-IDF 6.1 no longer breaks SPI init (Bus_SPI: zero-initialize spi_bus_config_t instead of memset(~0u) #281)
• I2C: a port the application already opened is shared instead of taken over (I2C: share a port the application already opened instead of taking it over #269)
• Autodetect probes with the software I2C port in every block until the board is confirmed (Probe with the software I2C port in every autodetect block until the board is confirmed #270)
• VLW fonts: spaces no longer erase the previous rows (fix(font): Prevent VLW spaces from erasing previous rows. #279, thanks @hlym123)
• Panel_AMOLED: a framebuffer object whose init failed is no longer kept (Panel_AMOLED: do not keep a framebuffer object whose init failed #285)
• Panel_LT8912B: the esp_lcd refresh callback member is chosen by presence, so both ESP-IDF 5.5.4 / 6.0.2 and 5.5.5 / 6.0.3 / 6.1 build without warnings; Touch_CST816S: getTouchRaw(tp, 0) no longer writes tp[0] (Sync common.hpp, Panel_LT8912B.cpp and Touch_CSTxxx.cpp with the shared lgfx source tree #286)
• Panel_EPD (PaperS3): the last 2 px of an update rectangle whose byte width is odd are refreshed; a 2 px wide update previously did not reach the panel (Sync Panel_EPD.cpp with the shared lgfx source tree #287)
• Built as an ESP-IDF component, the Arduino component is linked automatically (Link the Arduino component automatically when built as an ESP-IDF component #273)
• M5GFX.cpp no longer includes the legacy driver/i2c.h (Avoid the legacy driver/i2c.h include in M5GFX.cpp #284)
• Panel_LT8912B (the PoE-P4 display output board) reaches the bridge through lgfx::i2c and no longer needs anything from M5Unified; ESP-IDF builds no longer fail with "M5Unified I2C_Class is not available". M5UnitPoEP4HDMI::config_t gains i2c_port / pin_sda / pin_scl / i2c_master_bus; setI2C() still works for existing sketches (Sync Panel_LT8912B and the esp32 i2c layer with the shared lgfx source tree; M5UnitPoEP4HDMI takes the I2C port and pins in its config #290)

Additions

• JD9853 display support for M5ChainCaptain (Add JD9853 display support for M5ChainCaptain #274, thanks @hlym123)
• Panel_GC9A01 synced with the shared source tree (Sync Panel_GC9A01.hpp with the shared lgfx source tree #283)

(#272 tuned the SSD1677 LUTs for PaperMono and was reverted by #275 before release; no change ships.)

Merge after #290.